Patent GB-465825-A (GB)
Title: Improved lubricating compositions
IPC: C10M177/00
Filed: 1935-10-11
Abstract: A lubricating-composition is formed by blending an oxidation inhibitor with a hydrocarbon lubricating oil base stock and apreformed thickened oil, as defined below, soluble in the hydrocarbon oil.  The thickened oil is the product obtained by increasing the viscosity of a substantially water-insoluble liquid hydrocarbon, a synthetic wax obtained by the hydrogenation of a high molecular weight ketone, or an ester, namely a naturally occurring ester, a synthetic ester of a high molecular weight naphthenic acid, or one of the following synthetic esters viz: tricresyl phosphate, dibutyl phthalate, butyl tartrate, triethyl citrate and butyl lactate by modification of the constituents of the substance by heat treatment, voltolization, or by chemical means.  Heat treatment, e.g. batch heating at 500--700 DEG  F. using nitrogen or hydrogen gas as a means of agitation, with or without a catalyst, or heating under pressure or vacuum either alone or in the presence of steam, hydrogen or nitrogen may be employed for thickening glyceride oils such as linseed, soya bean, whale, rapeseed, cottonseed, and lard oil, and synthetic esters of high molecular weight naphthenic acids, e.g. glyceryl naphthenate. Thickening by voltolization may be employed for hydrocarbon oils, fatty oils, natural waxes, synthetic waxes prepared by hydrogenation of high molecular weight ketones, synthetic oils obtained by polymerization of olefines and alkylation of aromatic hydrocarbons, and synthetic esters, namely tricresyl phosphate, dibutyl phthalate, butyl tartrate, triethyl, citrate and butyl lactate.  Thickening by chemical means may be employed for hydrocarbon oils and esters, e.g. by treating with boron or hydrogen fluoride, aluminum chloride, sulphur, or selenium, oxidation at elevated temperatures, or nitration followed by heating.  The oxidation inhibiters employed are aromatic compounds having-hydroxy and/or amino and/or sulphur and/or selenium groups, organo metallic compounds, nitrated aromatic compounds, aliphatic hydroxy amines and allyl-isothiocyanate.  In examples, the lubricating composition comprises (1) voltolized di-N-butyl phthalate, a hydroxy amine and a naphthenic petroleum oil; (2) heat thickened soya bean oil, tertiary butyl phenol sulphide and hydrogenated mineral lubricating oil; (3) voltolized rapeseed oil, triphenyl bismuth and a Pennsylvania lubricating oil; (4) heat-treated whale oil, voltolized Pennsylvania oil, allyl iso-thiocyanate and lubricating oil; (5) Pennsylvania lubricating oil, voltolized rapeseed oil and alpha naphthol, naphthylamine or diacetyl tertiary-butyl phenol.  The lubricating compositions may be used inconjunction with other substances such as polymerization inhibitors, oiliness agents, thickeners, dispersing agents, pour point depressors, soaps and sulphonated compounds, and may be employed as textile oils.  Specification 369,197 is referred to.  According to the Specification, as open to inspection under Sect. 91, the base stock may comprise fatty oils, synthetic esters, e.g. tricresyl phosphate and dibutyl phthalate, and synthetic waxes and oils obtained by the destructive distillation of wood, coal and shale; the thickened oil may comprise heat-treated glycol oleate, glyceryl naphthenate, butyl-acetyl ricinoleate, hydroxy-stearic acid, ethyl linoleate or ethyl abietate, or these substances may be added to fatty oil before or after the heat treatment; an example comprises voltolized paraffin wax, a synthetic oil prepared by polymerizing cracked wax with aluminium chloride, and thio beta naphthol.  This subject-matter does not appear in the Specification as accepted.